cias MANTA 50, Installation Handbook

Page: 42 / 56

©
CIAS Elettronica S.r.l. Ed. 1.0
Installation Handbook page 41 of 59 MANTA 50 – 80
The figure shows a system which requires a RS 485 serial line with several branch loops(“Star”
network architecture) This architecture is created using a BUSREP as a multiplier.The 4 resulting
sections can be up to 1,200 mt. long each and a maximum of 32 devices,including the BUSREP,
can be connected to each one. The first section includes the seriale line converter
“STAR” NETWORK ARCHITECTURE USING “BUSREP” AS A MULTIPLIER
Line RS- 485
max 1200 mt.
L1
L4
BUSREP 1
L3
L2
Field
Devices
32
2
13,8 Vcc
0 Vcc
LOCAL
POWER-SUPPLY
SERIAL LINE
CONVERTER
RS-485/RS-232
RS-485 RS232
13
1 1 1
1
1
1
3
31
Field
Devices
Line RS- 485
max 1200 mt.
2
3 32
Line RS- 485
max 1200 mt.
Field
Devices
2 3 32
Field
Devices
2
3 32
1
The figure shows a system which requires a RS 485 serial line that is longer than 1,200 metres.
Using two BUSREPs as regenerators, it was divided up into 3 sections each of which was shorter in length.
In this case there are less than 32 field devices, but they can be distributed on 3,600 metres-long line.
Field
Devices
Field
Devices
Field
Devices
L1
L4
BUSREP 1
L3
L2
L1
L4
BUSREP 2
L3
L2
3
10
11
13
12
14 20
21
23
22
24
29
13,8 Vcc
0 Vcc
LOCAL
POWER-SUPPLY
SERIAL LINE
CONVERTER
RS-485/RS-232
RS-485
RS232
13
1 1 1
1
3.5 Remote Connection
To interface MANTA barrier to PSTN modem (9600 b/s) it is necessary the conversion RS485 to
RS232 and also the
cross conversion shown below.